Serum/plasma white blood cell count (qualitative, by automated cell counting)

When Would You Need This Test?

Your healthcare provider may order this test if you have symptoms like fever, fatigue, or unexplained infections, or if you’re being evaluated for conditions like leukemia, immune deficiencies, or autoimmune diseases. It’s also sometimes used as part of routine monitoring for certain treatments.

How Is the Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The blood is then analyzed in a lab to check for white blood cells. Unlike standard blood counts, this test doesn’t provide exact numbers but confirms their presence or absence.

What Does a Positive or Negative Result Mean?

A positive result means white blood cells are detected, which could indicate an active infection, inflammation, or other immune-related issues. A negative result suggests very few or no white blood cells, which may raise concerns about immune system dysfunction.

Common Conditions Linked to WBC Test Results

High levels of white blood cells may signal infections, allergies, or inflammatory conditions. Low levels could point to immune disorders, chemotherapy side effects, or severe infections. This test alone doesn’t diagnose specific conditions but helps guide further testing.